First, I would never EVER use VMware for a RAC environment. RAC = High Availability. Splitting a single host into multiple "little" systems, then using RAC is IMProfessionO down right idiotic. Because as soon as the "host" system crashes, you no longer have HA. The only thing that I would "maybe" consider it for a test or even dev environment but never for production.

That being said, have you looked at the documentation?
http://www.oracle.com/technetwork/products/clustering/oracle-rac-in-oracle-vm-environment-131948.pdf